hundreds having same issue

This is a very recent issue with Gmail's SMTP in Outlook. I can only send emails by clicking

then it unblocks the login at Gmail and the email is sent as usual. What is very cumbersome is that it keeps asking the same thing time and time again, as it is not saving the login credentials and closes the connection, so I have to repeat the procedure every time.

TLS Negotiation failed, the certificate doesn't match the host.

Per un account di dominio su Aruba, prima avevo smtp.nomedominio.ext / TLS / Porta 25

Posta in uscita(SMTP): smtps.aruba.it
Nome account: indirizzo di posta (es.: nomecasella@nomedominio.ext)
Password: la password scelta al momento della creazione della casella
Usa SSL: Attiva
Autenticazione: Password
Porta Server: 465

Same here, for a week now. Why isn't the problem solved! I can't reach people!

Same problem here. The alias account is pointed to a Godaddy server

I do not recommend using port 25 or 587 are not secure.

I had to change my Gmail settings.

These are the steps I took:

- Settings > Accounts and Import 

- Find the account in question (e.g. myemail@example.com <-- substitute your email here)
- Click "edit info"

- Enter your name and choose your alias setting (or leave it as-is this step doesn't really matter)

- Click "Next Step"

- MOST IMPORTANT: Change your SMTP Server setting

-- I previously had mine set to mail.example.com (where "example.com" was my custom domain). Your setting might be different, but what's important is what comes next. 

-- You'll need the domain of your host (dreamhost.com, hover.com, etc.)

-- Add "smtp." before the domain of your host

-- smtp.domainofyourhost.com (where "domainofyourhost.com" is the domain of the company that hosts your email).

- Port: 587

- Username: myemail@example.com (substitute your email here)

- Password: [the password your hosting company gives you for your email. It's probably different than your gmail password or from the password you use to log into your hosting company. If it's not different, it should be and you should go change your passwords now. ;) ]

- Click "Secured connection using TLS"

- Click Save Changes

That did the trick for me. I hope it works for you too.

Hat tip to my hosting company Dreamhost for the solution: https://help.dreamhost.com/hc/en-us/articles/115000326592-Use-Gmail-to-send-from-your-DreamHost-email-address

Alex Peck - YOU ROCK!! Thank you and we use dreamhost as well !!

Whoop! 

Thanks again!!

Unfortunately for me (Godaddy) the solution didn't work ...

Aquí tenemos el mismo mensaje de error. Se indican unas instrucciones que no solucionan el problema.

None of the fixes have worked for me either, including completely deleting and re setting up "Send mail as:" accounts.

I can send New emails from "Send as" accounts but cannot Reply to emails - they are all bouncing with "Message not delivered"

So before it was: mydomain.com

And now it is: mail.mydomain.com

Esa opción de colocarle al Servidor SMTP: smtp.dominion.com no esta funcionando ya que godaddy coloca mail.dominio.com

Que se debe hacer llame a un godaddy y me indique que le problema no es de ellos

saludos

In the Gmail settings under Accounts and Imports, Edit your Send mail as Email settings.

Change your outgoing servername (SMTP Server) to smtp.hostprovider.com (mine was smtp.dreamhost.com). If you are using your website name, (mail.example.com), this will continue to fail.

I also updated the port number from 587 to Port 465

Hope this helps.

Please advise how I can use my work email again without it bouncing back!

This started for me this morning after a send a few emails with no issues.  Tried all suggestions to no avail. No changes made on my side or on the part of the domain. Only apply to emails from my work email account which is routed through my gmail account (not my personal gmail accounts)  Receiving the "TSL Negotiation failed, the certificate doesn't match the host." error message. 

Please advise how I can use my work email again without it bouncing back! Need this especially since having to work from home now!

I need to work....

I'm seeing a lot of people have this issue, i solved it using an insecure connection over port 25, just go to your alias, edit it, put your smtp pass and select port 25, unsecure connection.

I know this it not the best choice for a lot of you, but as this problem is not fixed and i need to keep working, i opted on doing that.

Mismo problema como se soluciona esto?????

Try this...

when you set up your outgoing Server SMTP, try changing the Port and using unsecured connection instead of SSL or TLS. With Network solutionsm, they seem to now require port 25 instead of port 587.

Has anyone from Google/Gmail actually addressed this issue? I have received no response from submitting a help ticket.

So ATT got me as well for NOT telling about how they changed their mail servers :-(

Anyhow, BOTH companies suck.  BOTH SHOULD HAVE CONTACTED ME ABOUT THIS.  HOW HARD WOULD IT HAVE BEEN FOR GOOGLE TO EMAIL ALL OF IT'S USERS ABOUT THIS?  GREAT JOB GOOGLE!

Not prepared to change to 25 yet - come on google!

It's unsecured but effective for this problem.